Plumb WebTouchEvent::causesScrollingIfUncanceled to TouchEvent and

Plumb WebTouchEvent::causesScrollingIfUncanceled to TouchEvent and
    PlatformTouchEvent.

This will ensure that events that get re-routed from one renderer
to another preserves this bit.  Out of process renderers currenly
re-route input events from one renderer process to another, and we
need to preserve this bit for "touchmove"s to fire.

BUG=454568
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190390

[lazyboy, 2015-02-12 01:55:28]

lazyboy@chromium.org changed reviewers:
+ rbyers@chromium.org

[lazyboy, 2015-02-12 01:55:28]

+Rick for review,
this CL adds plumbing of a WebTouchEvent flag
(causesScrollingIfUncanceled) to core/platform so that
if input is re-routed from one renderer/ to another (which is the case
for <webview> and current implementation of out-of-process-iframes),
we preserve this bit.
This fixes a bug where touchmove-s start showing up on the <webview>
renderer/.

[Rick Byers, 2015-02-12 20:59:43]

rbyers@chromium.org changed reviewers:
+ schenney@chromium.org

[Rick Byers, 2015-02-12 20:59:44]

LGTM  (sorry for the delay - travelling / flight issues)

I'd really like to see some sort of end-to-end test for touch events and webview
to help catch things like this in the future (eg. maybe a content browsertest),
but I know this CL is urgent so let's not block on that here.

You still need a Source/web and Source/platform OWNER.  Perhaps schenney can
give you a quick stamp.

[lazyboy, 2015-02-16 21:27:54]

lazyboy@chromium.org changed reviewers:
+ aelias@chromium.org, vollick@chromium.org

[lazyboy, 2015-02-16 21:27:55]

schenney@ seems to be unresponsive, adding

+aelias for Source/web/WebInputEventConversion.cpp
+vollick for Source/platform/PlatformTouchEvent.h

Thanks.

[aelias_OOO_until_Jul13, 2015-02-17 21:20:26]

Source/web lgtm

[Ian Vollick, 2015-02-17 21:31:47]

On 2015/02/17 21:20:26, aelias wrote:
> Source/web lgtm

Source/platform lgtm

[lazyboy, 2015-02-18 03:53:51]

The CQ bit was checked by lazyboy@chromium.org

[commit-bot: I haz the power, 2015-02-18 03:54:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/920523003/1

[commit-bot: I haz the power, 2015-02-18 05:10:07]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190390